Motor-control system.



H. E: WHITE.

MOTOR CONTROL SYSTEM.

APPLICATION ,FljLBD J'UI Patented Dec. 6, 1910.

Wfcnesses;

terns, which the following is a specificacontact members during overload conditions I gram representative of the controller end Schenectady, county of Schenectady,

In the 'able and Wellknown manner.

be secured to an insulating sleeve 16 keyed UNITED STATES PATENT orrrcn HAROLD E. WHITE, OF S CHENECI'A DY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION (31 NEW YORK.

MOTOR-CONTROL SYSTEM.

Specification of Letters iatent. Patented Dec. 6, 1910.

Application filed July 19, 1910. Serial No. 572,715.

to said shaft in a well-known manner. In the controller shown there are five contact segments a, b, 0, d and e; and thesecontact segments coiiperete with fingers a, b, c, d and e. The two upper segmentsa; and b and their cooperating fingers a and Z) may be of any suitable and Well-known form- The three lower segments 0, d,- and e and their cooperating fingers c, d and e, Which regulate the amount of resistance in the motor circuit, are of a new form, which will now be described.

The segments 0, (Z and c are shown re spectively in Figs. 4c, 5 and (3 as mounted upon body members of insulating material 18, 19 and 20, which are of, the form shown. These body members 18, 19 and 20 act as. cams and engage the cotipereting contact fingers c" d and e inthe manner hereinafter explained. These contact fingers are movable and in the present construction are pivoteily supported. In the drawing the contact finger 0' only is illustrated, but it is to be understood that the fingers d and c are similar. The finger c is mounted upon an armature 21 pivoted at on the To all whom it may concern."

Be it known that I, HAROLD E. WHITE, a citizen of the United States, residing at State of New York, have invented certain new and useful I nprovements in Motor-Control Systion.

My invent-ion relates to motor controllers and its general object is to provide a. new and improved apparatus in which means is included for preventing overloading of the motor by too rapidly increasing the potential applied thereto.

In general, my invention com )rises a motor controller in which move le contact members are successively brought into en gagement with other contact members, and in which means responsive to conditions in the motor circuit is provided for holding certain of the lastonentioned contact members out of cotipcrative relation to the other in the motor circuit.

My invention will be fully understood from the following description and drawings, in which one embodiment of it is set forth.

magnet frame 23, and said armature c0- operates with' an electromagnet having amagnetizing coil 2-1 mounted as shown on a core extending from the frame 23. This frame 23 may be secured to the casing 8 in any suitable manner. The armature 21 carrying the contact finger c is biased away from the pole of t-he'electromagnet by a spring 26 arranged as shown. With this arrangement the contact finger c engages with the cum surface of the body member 18 which carries the contact segment 0, and when said finger is engaged by said cam the armature 21 is substantially in engagement with the pole of the electromagnet. hen, however, rotation of the shaft 10 has moved the-cam out of engagement with the contact finger c, said finger under the influence of drawings, Figure 1 is an elevation partly in section, of a controller having my invention embodied therein; Fig. 2 is a sectional plan view of said controller on the line A, A. of Fig. 1; Fig. 3 is a view, similar to Fig. 2, but with the controller shaft r0 tated through an angle of 90; Figs. 41, 5 and 6 are sectional plan views through the controller shaft showing the form of the segments mounted thereon, and Fig. 7 is e diathe motor circuits controlled by it.

I have shown my invention as embodied in a. controller of the drum type but of course it may be incorporated in many other kinds of control apparatus. Referring to the drawing, and particularly Figs. 1, 2 and 3, the contact members of the controller are shown as located within a casing 8 having a cover 9. The main shaft 10 of the controller carrying the handle 11 is journaled in the cop plate 12 and in the base 13 in any suit- The \isual star-wheel is shown 'at 1 1 and its cotlperating, follower at 15. The shaft 10 carries body membershereinafter referred to which may ment with the contact segment 0, unless it is held out of engagement by the magnetizing effect of the electromagnet upon the armature 21. Fig. 2 shows the Contact finger c in engagement with the cam surface of the body member 18, and Fig. 3 shows the contactlinger in engagement with the contact segment 0. of the body members 18, 19 and 2Ov which curry the contact segments 0, (Z and e are the spring 26 will be moved into engage- The forms and relation shown in \i-inis that as c". (/Y and leased the cams 1 intociw-gement n" contact segments 0 held out ot such e be no he hn The arrangein operation will inspection of u troller diagramma. ranged to cortrc-l 5h. *ction or rota once ll", ll and tact segments a members which rcntionally and the contact fin conventional manner. diagrammatic ill 1; and c are shown as nally movable cores in o tures, these cores acing contact segmei. being arranger .1 o of electron agneis ha'vin ergized from the motor nected perman ly in other and all in shunt to the res R and R In order to are have used the same reference I Fig. 7 as in the other to responding parts. l.\; and c are connet the upper finger a. connecteo to toe sou ce L, and the other tinge at") c various circuits in the diagram. For the s motor has been shown wi The mode. of operation a'oore described system is as follows s the System is shown in Fig. T. the controlle in the of position and the in connected from the source. l dle is moved to luring the control alto.

. tlior one ulrcsist said "it in th inplici t =7ound return.

the haner segments ger a, segment (2, scnnent. l linger b, istance R 11 and R and motor M to ground. Current also passe? thr ugh the magnets 2% which are connected in series with one another and in hunt the r sistance R, R and ll These magnets are connected across the source in series with the motor and, therefore, receive cur 'ent which is proportional to the C lerenc s between the potential of the son ce and the po tential of the motor. 3." i the-controller handle is in this the met 1 Will operate Wlil all i I its Cl73- cuit. When however to the position. 0:, the contact mg." longer engaged by the coopcrat' "nee the supporting member "i gel is free to more into e1 he segment 0 under the. imlu r ring 26 unless the coiiperatin sutliciently energized to maint armature 21 attracted to it. in prac magnetis so designed thatit ill l l armature to it as low as the p the motor tcrn'iinals 1s heron a which means that an o c ists in the motor circuit.

he motor potential rises a rare mentioned, the cnrr 3Z1 magnet. coil so reduced tl releases the armature and the g engagement- With the segmei. short-circuiting the section ol? 1 is long as the controller remai "position the motor will operate P, this action taking pla the control oil the coope nets exactly as in the case 0' inst described. t course. controller may he in'nnedia" position 2, whereupon the tingns c. (I c will come into engagement; with th; operating segments one after another the control of their electroinagncts. magnets are so designed that the linger d and c Will be released in sac ion the potential of the motor has risen to suecessively higher values at each of which the current in the motor circuit ma substantially the same owing to the Cflllbltllltly decreasing amount of resistance in the motor circuit. Of course, if: desired, the ma at coils may be connected directly in the motor circuit or they may be connected in shunt. to a special resistance, 0 a. portion of the main starting resistance located in the motor cuit. When the controller is thrown l iclc toward the ofi? position, the cam sin. of the supporting members 18. 1.9 and engage With the fingers 0', cl and c" and. sin; cessively more said fingers into the position illustrated in Fig. 2 in which the armatnref-s carrying said fingers are in engagement with the poles of their cooperating magnets.

In the arrangement shown in this application, 1 have provided cams -for IDOVlDf the contact fingers to the position in Whichthey are held-by their cooperating magnets when the current. in the motor circuit exceeds a cer'ain value, because such cams may under some conditions render the arrangement more positive inits operation. It is of course obvious, however, that said cams might be omitted and the magnets so tact lingers will. not only be held by said magnets in a certain position but will also be attracte and actually moved by said magnets when the potential of the motor is below a certain value. Even when cams are employed as shown, the magnets operate to a certain extent to cause movement of the fingers,-as vvell as to hold said fingers in a certain position. i

It is evident that my invention may be embodied in a. great variety of control arrangements Without departing "roin the spirit thereof. The controller which I have shown is exceedingly simple and I have omitted all such. features such. as reversing drum, blowout devices, etc. Of course, instead of etfecting" the connections in the motor circuit directly in the controller, said controller may be used as a. master-switch and contactors employed in a Well-known manner. It is my intei'ition to cover all such arrangements in the following claims.

\V hat I claim as new and desire to secure byl actters Patent of the United States, is:

l. A motor controller having movable iaontact members, contact lingers coiiperat ing therewith, and means responsive to com ditions in the motor circuit for holding said lingers out of engagement with said contact members during overload conditions in the motor circuit.

23. contact inemlwrs, contact lingers cooperat inn therewith, means for moving said contact fingers into an inoperative position, and means re ponsive to conditions in the n'wtorcircuit for holding said lingers in this inoperative position and out or engagement with said movable contact members during overload ('OlHillTlOllF in the motor circult.

motor controller having movable contact members, contact lin ers cooperating therewith, means movi with said movable contact members for moving said lingers into an ino erativc position and holding them in said position while said contact members are not in a posit ion to coopcralcwith said lingersaandmeans rcsnonsive to conditions in the motor circuit for holding said impairs out of engagement with said contact nicmbc after said fingers-are released by said lastmentioned means dur inc; overload conditions in the motor circult.

it-A motor controller having movable contact scgmcnis, movable contact fingers A motor controller having movable.

cooperating therewith, and magnetic means responsive to conditions in the motor cir-- cu-it' for holding said lingers out of engagw ment with said segments during overload conditions in the motor circuit.

5, A motor controller having movable contact segments, movable contact lingers cooperating therewith, and magnets encrgized from the motor circuit for holding said lingers out of engagement with said segments during overload comlilions in the motor circuit.

(3. A. motor controller having movable contact segments. contact lingers monorai inn therewith, means for moving said coutact lingers out of operative position. and magnets energized from the motor circuit for holding said lingers out oil operative position and out of cnpax emcnt with said movable contact ineml'ie during overload conditions in the motor circuit.

7. A motor controller having movable contact segments, movable contactlingers cooperating; therewith, cams arranged to move said lingers into an inoperative position While said contact members are not in a position to cooperate with. said fingers, and magnetic means energized from the motor .circuit. for holding" said lingers in said inoperative position during overload conditions in the motor circuit.

8. A motor controller having contact segments mounted on a rotatable shaft, pivoted contact lingers cooperating with said meats, and mania-tic devices energized from the motor circuit for holding said fingers out cngagcnicnt with said segments d llinnovcrlozul conditions in the motor circuit.

9. A motor controller having contact ser mcnts mounted upon a rotatable shaft, pivoted contact lingers cooperating uilb said segments, cams carried, by said \a'lt for holding said lingers out oi coin),v .dive relation to said segments just before said nicn'ts during the on rotation oi the shall: come into cooperative relation with said lingers, and magnets energized :lrom the motor circuit "(or holding said lingers in the position to which the cams move them independently oi. said cams during overload conditions in the motor circuit.

In witness \vhercol I have hereunto set my hand this 18th day of July, 1910. 

